已知函数f(x)=x(x²-ax-3) (Ⅰ)若f(x)在区间【1+,+∞)上是增函数,求实数a的取值范围;已知函数f(x)=x(x²-ax-3)(Ⅰ)若f(x)在区间【1+,+∞)上是增函数,求实数a的取值范围;(Ⅱ)若x=-1/3是f(x)的极
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![已知函数f(x)=x(x²-ax-3) (Ⅰ)若f(x)在区间【1+,+∞)上是增函数,求实数a的取值范围;已知函数f(x)=x(x²-ax-3)(Ⅰ)若f(x)在区间【1+,+∞)上是增函数,求实数a的取值范围;(Ⅱ)若x=-1/3是f(x)的极](/uploads/image/z/3008191-31-1.jpg?t=%E5%B7%B2%E7%9F%A5%E5%87%BD%E6%95%B0f%28x%29%3Dx%28x%26%23178%3B-ax-3%29+%28%E2%85%A0%29%E8%8B%A5f%28x%29%E5%9C%A8%E5%8C%BA%E9%97%B4%E3%80%901%2B%2C%2B%E2%88%9E%29%E4%B8%8A%E6%98%AF%E5%A2%9E%E5%87%BD%E6%95%B0%2C%E6%B1%82%E5%AE%9E%E6%95%B0a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%EF%BC%9B%E5%B7%B2%E7%9F%A5%E5%87%BD%E6%95%B0f%28x%29%3Dx%28x%26%23178%3B-ax-3%29%28%E2%85%A0%29%E8%8B%A5f%28x%29%E5%9C%A8%E5%8C%BA%E9%97%B4%E3%80%901%2B%2C%2B%E2%88%9E%29%E4%B8%8A%E6%98%AF%E5%A2%9E%E5%87%BD%E6%95%B0%2C%E6%B1%82%E5%AE%9E%E6%95%B0a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%EF%BC%9B%EF%BC%88%E2%85%A1%EF%BC%89%E8%8B%A5x%3D-1%2F3%E6%98%AFf%28x%29%E7%9A%84%E6%9E%81)
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已知函数f(x)=x(x²-ax-3) (Ⅰ)若f(x)在区间【1+,+∞)上是增函数,求实数a的取值范围;已知函数f(x)=x(x²-ax-3)(Ⅰ)若f(x)在区间【1+,+∞)上是增函数,求实数a的取值范围;(Ⅱ)若x=-1/3是f(x)的极
已知函数f(x)=x(x²-ax-3) (Ⅰ)若f(x)在区间【1+,+∞)上是增函数,求实数a的取值范围;
已知函数f(x)=x(x²-ax-3)
(Ⅰ)若f(x)在区间【1+,+∞)上是增函数,求实数a的取值范围;
(Ⅱ)若x=-1/3是f(x)的极值点,求f(x)在[1,4]上的最大值
(Ⅲ)在(Ⅱ)的条件下,是否存在实数b,使得函数g(x)=bx的图像与函数f(x)的图像恰有3个交点?若存在,请求出实数b的取值范围;若不存在,试说明理由.
已知函数f(x)=x(x²-ax-3) (Ⅰ)若f(x)在区间【1+,+∞)上是增函数,求实数a的取值范围;已知函数f(x)=x(x²-ax-3)(Ⅰ)若f(x)在区间【1+,+∞)上是增函数,求实数a的取值范围;(Ⅱ)若x=-1/3是f(x)的极
f(x)=x(x²-ax-3)
f'(x)=3x^2-2ax-3
(1) 由于f'(x)是开口向上的抛物线
f'(x)=3(x-2a/3)^2-3-4a^2/3
即 2a/3